Domestic appliance



Feb. 26, 1952 F. H. MCCORMICK DOMESTIC APPLIANCE 4 Sheets-Sheet 1 Filed April 28, 1949 FIG. 2

Feb. 26, 1952 oc 1c 2,587,187

DOMESTIC APPLIANCE Filed April 28, 1949 4 Sheets-Sheet a Feb. 26, 1952 F. H. Mcco c 2,587,187

DOMESTIC APPLIANCE Filed April 28, 1949 4 Sheets-$heet 5 FIGS Feb. 26, 1952 F. H. M CORMICK DOMESTIC APPLIANCE 4 Sheets-Sheet 4 Filed April 28, 1949 Patented Feb. 26, 1952 DOMESTIC APPLIANCE Francis H. McCormick, Oakwood, Ohio, assignor to General Motors Corporation, Dayton, Ohio, a corporation of Delaware Application April 28, 1949, Serial No. 90,092

17 Claims.

This invention relates to domestic appliances, and more particularly to a timer for electric ranges or the like.

An object of this invention is to provide a timer, which is adapted to close and open the circuit to the oven of an electric range or the like, at predetermined times, and which timer is provided with a single setting handle which automatically, and correctly, places the timer in or out of control of the oven circuit, and also correctly sets the "start and stop pointers or dials.

Another object of this invention is to provide a timer for electric ranges or the like, in which the usual "off or "set lever is omitted.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings, wherein a preferred form of the present invention is clearly shown.

In the drawings:

Fig. 1 is a vertical cross-section taken generally longitudinally of the timer;

Fig. 2 is a horizontal cross-section taken along the line 22 of Fig. 1;

Fig. 3 is a horizontal cross-section taken along the line 3-3 of Fig. 1;

Fig. 4 is a cross-section taken along the line 4-4 of Fig. 3;

Fig. 5 is a cross-section taken along the line 5-5 of Fig. 1;

Fig. 6. is a cross-section taken along the line 6-6 of Fig. 1;

Fig. 7 is a horizontal view, partly in plan, and partly in cross-section; and

Fig. 8 is an enlarged view of the main portion.

of Fig. 1.

The timer includes a synchronous motor ll) of the usual type, which drives gears II through I6, to impart thereto the speed of an hour hand. The disk I! is connected by the sleeve I8 with the hour hand I9. The minute hand 26 is driven through the shaft 2| and gears 22 and II at minute hand speed. A sleeve 23, fixed on the plate 24 forms a bearing for the sleeve I8 and shaft 2|.

Stop dial 25 and start dial 26 are loosely and rotatably mounted about the sleeve I8 just below the hour and minute hands. These dials are respectively held in gears 21 and 28 which are circumferenti-ally placed around the geared periphery of these dials. The gears 21 and 28 are mounted within pins 29 held between the plates 24 and 30, and provided with springs 3| and spacer sleeves 32 and 33 in a manner to main- 2 tain the dials 25 and 26 at a substantially fixed vertical level; but maintaining them in a rotational condition, which has some frictional resistance.

The spring 34 has one end 35 secured to the dial 26 by means of the pin 36. The other end 31 of the spring 34 is connected by pin 38 with the dial 25. This pin 38 extends into a long arcuate slot in the dial 26 to permit an ample amount of relative rotation between them, but nevertheless limited in amount. There is sulficient power in the spring 34 to rotate the dial 25 into coincidence with the dial 26, should the dial 25 be released from engagement with the gear 40, hereafter to be more fully described. On the other hand, the frictional resistance in the gears 21 and 28 are generally sufficient to maintain the dials 25 and 26 in their set position, when the gear 40 is in simultaneous engagement with the set dials 25 and 26.

The dials 25 and 26 may be set by rotation of the gear 40, which is fixed to a sleeve 4| riding around a pin 42, and being provided at its upper end with a setting knob 44. The sleeve 4| is maintained at its normal level by a leaf spring 43 which has a grooved engagement with the sleeve 4|. The normal level is indicated in Fig. 4. The sleeve 4| also has fixed thereto a gear 45, which can engage the geared lever 46 (hereafter to be described). This engagement may be accomplished by pushing down on the knob 44, which movement simultaneously engages the gear 45 with the lever 46 and disengages the gear 40 from the dial 25. A small disk 41 is loosely mounted around sleeve 4 I, in such a manner that it remains substantially at the same elevation when the sleeve 4| is depressed; but which may be lifted upwardly, by the flange 48, out of engagement with the lever 49.

A switch actuating shaft 50 is pivoted on the bearing 5| at its lower end and the bearing 52 carried in the bearing plate 52a at its upper end. The shaft 50 carries the levers 46 and 49 fixed thereto. A spring 53 imparts a rotational movement to the shaft 50, which is clockwise, as viewed in Figs. 2 and 3.

The shaft 50 (see Fig. 5) opens and closes the switch contacts I5| through the medium of a cam I52 acting on the pin I53, against the tension of the springs 54. Any form of switch construction may be used, which opens and closes the contacts I5I, as the lobes 55 and 56 and the valleys 51 and 58 ride into contact with the pin I53. The lobes open switches, and the valleys close the switches.

Merely by way of example, the pin 153 is connected to a T-shaped plate 69 of electrical insulating material. The plate 69 loosely straddles the shaft 56, and is provided with lugs 6|, which engage the ends 62 of the contact arms 63, which carry the contact points The springs 54 are caught in hooks 94 formed on arms 63. The other ends of the springs 54 are hooked over a U-shaped plate 65 of electrical insulating material which is placed loosely around the shaft 50.

Stationary contacts 66 are carried by plates 61, which extend through the insulating plate 68, and have suitable connectors on the underside of the plate 68. Other conducting plates 69 are in conducting engagement with the arms 63, and are also fixed and extend through the insulating plate 68, and have connectors on the underside of plate 68. The plate 61 may be connected to the power source, and the plate 69 may be connected to the range thermostat, which in turn controls the oven heaters, or vice versa. The plates 69' may obviously be connected to any other device to be controlled, whether it is an oven or other energy consuming device.

The knob 19 may be used to set the hour and minute hands l9 and 29, and the knob 44 may be used to set the start and stop dials 26 and 25, and the switches this latter action to be more fully described.

The disk l1 rotates in definite relationship with the hour hand I9 and carries a hinged lever 1|, which is adapted to engage the pins 36 and 38 at the proper start and stop times. The engagement of the lever 1| with the pins 36 and 38 releases, step by step, the lever 49, which is provided with steps 12 and 13 which may come into engagement with a pin 14, under the control of the movement of the lever 1 l.

The pin 14 and the lever 11 are correlated through the medium of another disk 15, which is loosely mounted about the bearing 23. A spring 16 has one end 11 hooked into plate 24, and its other end 19 in engagement with the pin 14. The action is such as to give the disk 15 a counterclockwise movement, as it is viewed from the top of the timer.

The plates 15 and [1 are connected through the medium of a gear 69 loosely carried on a pin 8| on plate 11. The gear 80 engages the external gear 82 of the plate 15. The gear 80 also has another gear 83 integral therewith, and which is provided with minute gear teeth 84. These gear teeth are engaged by a plate 85 carried by the lever 1!, whenever the lever 1| comes into contact with the pins 36 and 38.

The lever 1|, as viewed in Fig. 2, is pulled to the left by means of a spring 86 one end of which is connected to the lever 1| and the other end of which is connected to the disk [1. The lever 11 is pivoted about the pin 81 on disk 11, and is guided in its movements by the pin 88, also on disk l1. The action is such that whenever the blade 85 engages the teeth 84, the gears 83 and 80 are latched against rotation, and this in turn locks the disks l1 and 15 together and causes the disk 15 momentarily to turn. at hour hand speed, together with disk l1. This momentary turning of the disk 15 slowly moves the pin 14 (see Fig. 3) in a clockwise direction, away from the lever 49. If, at that time, the steps 12 or 13 are in engagement with the pin 14, then the steps are released, and the plate 49 quickly snaps clockwise to the end step. The step 12 is locked at a larger radius from the shaft 50 than is step 13.

As a consequence, the step 13 may be released by the pin 14, and the lever 49 may snap from step 13 to step 12, and it requires a further movement of the pin 14 to release the step 12.

When the shaft 59 and levers 46 and 49 are at their fartherest clockwise position (one farther position than in Fig. 3), the contacts l5l are closed. When the shaft 50 is in the position shown in Fig. 3, switches l5l are open. When step 12 is in engagement with the pin 14, the switch I51 is closed. Consequently, when the shaft 50 is in its fartherest counterclockwise position (step 13 in engagement with pin 14), the switch 15] is open; because in that position the timer has been placed in control of the circuit, but the hour hand l9 has not reached the start position (3:45 p. m., for example), as the hour hand l9 approaches the start position (3:45 p. m. for example), the pin 36 engages the arm 91 of the lever 1| to move the blade into engagement with the teeth 84 which, as explained before, locks the gears 83 and 80 and the disks l1 and 15 so that the pin 14 is slowly moved from step 13, and the lever 49 snaps the step 12 into engagement with the pin 14. This slight rotation of the shaft 56 and its cam I52 closes the switches I51. The release of the step 13 is caused by the mo-- mentary movement of the plate 15 and the pin 14 a sufficient distance to release the step 13. Thereafter, when the hour hand reachesthe stop position (5:00 p. m., for example), the pin 38 engages the arm 91 of the lever 1|, and produces a slightly greater movement of thepin 14, to release step 12, so that the lever 49 quickly snaps and engages the small disk 41, to assume the position shown in Fig. 3. The consequent movement of the gears 22 now opens switches I51.

Since the stop disk 25 is provided with an arcuate slot 90, and since thedisk 26 is provided with a suitable colored arc 9|, the user, after 5 p. m. (for example) would note the exposed colored arc 9|, and would know that the timer had stopped the cooking operation and know that the timer would maintain the circuit open until such time as the disks 25 and 26 are moved into coincidence, with the start and stop indicators together. If the user wishes to use the thermostat without the timer, therefore to take the timer out of control, he will pull up on the knob 44, which in turn pulls the small disk 41 up to allow the lever 49 to snap underneath the disk 41. Pulling up of the knob 44 also pulls the gear 40. out. of engagement with the gear 26 and this allows the spring 34 to move the disks Hand 26 into coincidence.

A one-way spring ratchet construction 92 is in engagement with the stop disk 25, which permits the same to be rotated clockwise, and prevents it from being rotated counterclockwise. This construction may be mounted anywhere around the periphery or on top of the disk 25.v For example, a pin 93 may be suspended from the plate 36, on which the lever 92 is pivoted. An other pin 94 may also be suspended from the plate 30, and a spring 95 may be interposed between the pin 94 and the lever 92.

The arrangement of theconstruction 92 is for the purpose of requiring the user always to set the stop disk 25 by clockwise rotation. Thereafter, when the knob 44 is depressed, to set the start dial 26 by counterclockwise rotation, the stop dial 25 is maintained stationary, and is prevented from following the dial 26 under the ten-, sion of the spring 34.

The timer may also include the usual-glass face 56, held against the plate 30 by the bevel plate 91. 7

Throughout the foregoing specification, the device has been described as though Fig. 1 is a vertical cross-section. This assumption, however, is only for the purpose of description. It is to be understood that, in ordinary use, the face 96 would be in a vertical position, facing the user. For example, when, in the foregoing description, it is described that the knob 44 is pushed down, in actual use this would really be pushed away from the user, probably in a horizontal direction.

In the operation of the device, the user may set the timer to coincide with the actual time or the like, by operation of the knob 10, it being understood that the necessary slip clutch is present below the gear I I.

Whenever the user wishes to place his timer in control of the range, the knob 44 is turned to move the disks 25 and 26 clockwise until the arrow stop is at the required stopping time, for example, 5 p. m. Thereafter the knob 44 is pushed down, away from the user, and the knob is rotated to rotate the disk 26 counterclockwise so that the beginning of the colored are 9| is at the desired start time, for example, 3:45 p. m. The knob 44 is thereafter released. During these operations, nothing happened to the shaft 59 while the disks and 25 were being moved clockwise. However, when the knob 44 was depressed to rotate the disk 23 counterclockwise, the gear 45 meshed with the geared lever 46 and rotated the shaft 50, together with the lever 49 counterclockwise to a position where the step 13 becomes hooked over the pin 14. The pivot pin 81 cooperates with an elongated aperture in the lever H which makes it possible for the pin 36, upon counterclockwise movement of the disk 26, to disengage itself from the arm 91.

Under these conditions the switches l5! are open, so that the oven heaters cannot be energized until the hour hand [9 reaches 3:45 p. m. At that time (3:45) the pin 33 has been contacted by the end 91 of the lever H, as the disk I! rotates in conjunction with the hour hand Hi. This has caused the blade 85 to lock the gears 83 and 80 against rotation and has thereby caused the disk 15 to rotate with the disk IT. This slight clockwise movement of the disk I5, also moves the pin 14 clockwise, and at 3:45 has reached a position such that the step 73 is released, and the lever 49 is allowed to snap the step 12 into engagement with the pin 14. In this position of the lever H, the switches [5| are closed to energize the oven heaters. As the hour hand passes beyond 3:45, the pin 36 passes beyond end 97 of the lever H, thus releasing the disk 15 and not causing any further movement of the pin '14.

By the time that the hour hand has reached 5 p. m., the end 91 of the lever H has been engaged by the pin 38 a sufficient extent so that the gears 83 and an have again been locked to cause movement of the pin 14 a sufficient distance to release the step 12. This causes the lever 49 to snap into engagement with the small disk 4'1, to the position shown in Fig. 3. Thus, while the switches l5| were closed while the step I2 was in engagement with the pin 14, the switches are opened when the lever 49 reaches the position shown in Fig. 3.

This causes the timer to remain in control of the oven, and prevent its energization until the towards the user. This raises the disk 41 and allows the lever 49 to snap under the disk 41 a sufiicient distance to close the switches I5l. Thereafter the thermostat may be used to control the oven, independently of the timer, since the switches l5| remain closed indefinitely until such time as the disks 25 and 26 are again moved out of coincidence by a counterclockwise movement of the disk 26.

The oven heater or heaters may be controlled by a thermostat having a switch means in series with one or both of the timer switches. The thermostat may be controlled and adjusted by a knob adjustable to off and temperature positions. When the timer is taken out of control of the oven, the thermostat knob is to be turned to off, manually, unless it is desired to use the oven at that time.

While the form of embodiment of the invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, as may come within the scope of the claims which follow.

What is claimed is as follows:

1. A controlling arrangement including a clock having a shaft means rotated in accordance with the hour hand of the clock, a first indicator means for indicating the termination of a timed period controlled by said clock, a second indicator means for indicating the beginning of such a timed period, indicator setting means connecting directly with said first and second connector means for setting said first and second indicator means to desired positions, a control device, a power means for operating the control device, means cooperating with said shaft means and said first and second indicator means for releasing said power means at times corresponding to the setting of the second and first indicator means to operate said control device to initiate and terminate such a timed period, said indicator setting means being provided with directly connected means effective directly coincidental to the spacing of the beginning and terminating points of the first and second indicator means for energizing said power means.

2. A controlling arrangement including a clock having a shaft means rotated in accordance with the hour hand of the clock, a first indicator means for indicating the termination of a timed period controlled by said clock, a second indicator means for indicating the beginning of such a timed period, indicator setting means connect-- ing directly with said first and second indicator means for setting said first and second indicator means to desired positions, a control device, a spring-operated power means for operating the control device, said power means having means providing a plurality of latching positions, means cooperating with said shaft means and said second and first dial means for releasing said power means from one latching position at a time corresponding to the setting of the second dial means and for releasing said power means from a second latching position at a time corresponding to the setting to the setting of the first dial means, said indicator setting means being provided with a directly connected operating means directly cooperating with said power means directly coincidental to the spacing of the beginning and terminating points of said indicator means for winding up the spring mechanism of said springoperated power means.

3. A controlling arrangement including a clock having a shaft means rotated in accordance with the hour hand of the clock, a first indicator means for indicating the termination of a timed period controlled by said clock,a second indicator means for indicating the beginning of such a timed period, setting means for setting said first and second indicator means to desired positions, a control device, a means cooperating with said shaft means and said first and second indicator means for operating said control device at times corresponding to the setting of the second and first indicator means to initiate and terminate such a timed period, said setting means being provided with a transmission means normally connecting said first and second indicator means to operate together, a spring means having a relative turning action upon said first and second indicator-means to cause the first indicator means to turn in a direction opposite the second indicator means, a stop means for stopping the relative rotation of said indicator means when the beginning and termination indications substantially coincide, said setting means having means for disengaging said transmission means from one of said indicator means to render effective said spring means to turn the indicator means until said indications substantially coincide.

4. A controlling arrangement including a clock having a shaft means rotated in accordance with the hour hand of the clock, a first indicator means for indicating'the termination of a timed period controlled by said clock, a second indicator means for indicating the beginning of such a timed period, indicator setting means connected directly with said first and second indicator means for setting said first and second indicator means to desired positions, a control device, a power means for operating the control device, means cooperating with said shaft means and said first and second indicator means for releasing said power means at times corresponding to the setting of the second and first indicator means to operate said control device to initiate and terminate to such a timed period, said indicator setting means being provided with directly connected selective means for directly releasing said power means to operate said control device.

5. A controlling arrangement including a clock having a shaft means rotated in accordance with the hour hand of the clock, a first indicator means for indicating the termination of a timed period controlled by said clock, a second indicator timed period, a single indicator setting knob for setting said first and second indicator means to desired positions, a control device movable to operating and non-operating conditions, power means for operating the control device, means cooperating with said shaft means and said second indicator means for controlling said power means to move said control device to the operating condition and for cooperating with said shaft means and said first indicator means for controlling said power means to move said control device to the non-operating condition, said single indicator settingknob being also provided with directly connected means for controlling said power means to move said control device to the operating condition.

6. A controlling arrangement including a clock having a shaft means rotated in accordance with the hour hand of the clock, a first indicating means for indicating the termination of a timed period controlled by said clock, a second indicator means for indicating the beginning of such a timed period, a single indicator setting knob for setting said first and second indicator the hour hand of the clock, a first indicating means for indicating the termination of a timed period controlled by said clock, a second indicator means for indicating the beginning of such a timed period, a single indicator setting knob for setting said first and second indicator means to desired positions, a control device movable to operating and non-operating conditions, means cooperating with said shaft means and said second indicator means for moving said control device to the operating condition and for cooperating with said shaft means and said first indicator means for moving said control device to the non-operating condition, and means directly controlled by a predetermined manual manipulation of said single indicator setting knob and effective following the above set forth movement of said control device to the operating and non-operating condition for moving said control device from the non-operating condition to the operating condition.

8. A controlling arrangement including a clock having a shaft means rotated in accordance with the hour hand of the clock, a first indicator means for indicating the termination of a timed 1 period controlled by said clock, a second indicator means for indicating the beginning of such a timed period, indicator setting means for setting said first and second indicator nieans to desired positions, a control device, a power means for operating the control device, means cooperating with said shaft means and said first and second indicator means for releasing said power means at times corresponding to the setting of the second and first indicator means to operate a, said control de ice to initiat t n means for indicating the beginning of such a V e and erml ate Such a timed period, said indicator setting means being provided with directly connected means responsive to a predetermined manipulation thereof for manually controlling said power means to discontinue the control of said control device by the clock.

9. A controlling arrangement including a clock' having a shaft means rotated in accordance with re hour hand of the clock, a first indicator means for indicating the termination of a timed period controlled by said clock, a second indi- ;cator means for indicating the beginning of such a timed period, indicator setting means for setting said first and second indicator means to desired positions, a control device, a power means for operating the control device, means cooperating with said shaft means and said first and second indicator means for releasing said power means at times corresponding to the setting of the second and first indicator meansto operate said control device to initiate and iterminate such a timed period, said indicator set. ting means being provided with directly connected means effective following the release oi said power means according to the setting of said first and second indicator means and responsive to a predetermined manipulation of a portion of the indicator setting means for manually controlling said power means to discontinue the control of said control device by the clock.

10. In combination, a clock having: an hour hand; a start indicator, a stop indicator; a switch; a settable power-operated means for opening and closing said switch; means under the control of said indicators and hour hand for serially releasing said settable power-operated means to open and close said switch; and a single manipulator having means for positioning said indicators and also having means for controlling said settable means.

11. In combination, a clock'having: an hour lhand; a start indicator, a stop indicator; a switch; a settable power-operated means for opening and closing said switch; means under the control of said indicators and hour hand for serially releasing said settable power-operated means to open and close said switch; and a single manipulator positioning said indicators into and out of coincidence and setting said settable means when positioning said indicators out of coincidence, said single manipulator having means for completely releasing said settable means with said switch in closed position when positioning said indicators into coincidence.

12. In combination, a clock having: an hour hand; a start indicator, a stop indicator; a switch; a settable power-operated means for Opening and closing said switch; means under the control of said indicators and hour hand for serially releasing said settable power-operated means to open and close said switch; and a single manipulator positioning said indicators into and out of coincidence and setting said settable means when positioning said indicators out of coincidence with said switch in open position, said single manipulator having means for completely releasing said settable means with said switch in closed position when positioning said indicators into coincidence.

13. In combination, a clock having: an hour hand; a start indicator, a stop indicator; a switch; a settable power-operated means for opening and closing said switch; means under the control of said indicators and hour hand for serially releasing said settable power-operated means to open and close said switch; and a single manipulator positioning said indicators into and out of coincidence and setting said settable means when positioning said indicators out of coincidence with said switch in open position, said single manipulator having means for completely releasing said settable means with said switch in closed position when positioning said indicators into coincidence, said hour hand and start indicator closing said switch when they come into coincidence, and said hour hand and stop indicator opening said switch when they come into coincidence.

14. A controlling arrangement including a clock having a shaft means rotated in accordance with the hour hand of the clock, a first indicator means for indicating the termination of a timed period controlled by said clock, a second indicator means for indicating the beginning of such a timed period, a single indicator setting means having one position effective for setting said first indicator means to desired positions and a second position effective for setting said second indicator means to desired positions, a control device, a spring operated power means for operating the control device, means cooperating with said shaft means and said first and second indicator means for releasing said power means at times corresponding to the setting of the second and first indicator means to operate said control device to initiate and terminate such a timed period, said indicator setting means and said spring operated power means being provided with connectible motion transmitting means effectively aligned for operative connection in one of said two positions for winding up the spring operated power means as the indicator setting means is operated in said one position.

15. A controlling arrangement including a clock having a shaft means rotated in accordance with the hour hand of the clock, a first-indicator means for indicating the termination of a timed period controlled by said clock, a second indicator means for indicating the beginning of such a timed period, a single indicator setting means having one position effective for setting said first indicator means to desired positions and a second position effective for setting said second indicator means to desired positions, a control device, a spring operated power means for operating the control device, means cooperating with said shaft means and said first and second indicator means for releasing said power means at times corresponding to the setting of the second and first indicator means to operate said control device to initiate and terminate such a timed period, said indicator setting means and said spring operated power means being provided with connectible gearing effectively aligned for geared connection in one of said two positions for winding up the spring operated power means as the indicator setting means is operated in said one position.

16. A controlling arrangement including a clock having a shaft means rotated in accordance with the hour hand of the clock, a first indicating means for indicating the termination of a timed period controlled by said clock, a second indicator means for indicating the beginning of such a timed period, a single indicator setting knob for setting said first and second indicator means to desired positions, a sequentially operable control device movable in sequence from the nonoperating condition to the operating condition thence to the nonoperating condition and again to the operating condition, power means for operating said control device, means cooperating with said shaft means and said second indicator means for controlling said power means to move said control device from the first nonoperating condition to the first operating condition and for cooperating with said shaft means and said first indicator means for controlling said power means to move said control device from the first operating condition to the second nonoperating condition, said single indicator setting knob also having a third position, said single indicator setting knob and said control device having motion transmitting means effective in said third position for causing the movement of said control device from the second nonoperating condition to the second operating condition.

17. A controlling arrangement including a clock having a shaft means rotated in accordance with the hour hand of the clock, a first indicator means for indicating the termination of a timed period controlled by said clock, a second indicator means for indicating the beginning of such a timed period, a single indicator setting knob having one position effective to set said first indicator means to desired positions and a second position effective It to set said second indicator means to other desired positions, a control device movable to operating and nonoperating conditions, power means for operating the control device, means cooperating with said shaft means and said second indicator means for controlling said power means to move said control device to the operating condition and for cooperating with said shaft means and said first indicator means for controlling said power means to move asid control device to the nonoper- 10 ating condition, said single indicator setting knob and. said power means being provided with connectible motion transmitting means efiectively aligned for operative connection in one of said two positions for energizing said power means as the single indicator setting knob is operated in said one p sition.

FRANCIS H. MCCORMICK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 22,570 Lux Nov. 28, 1944 2,361,262 Candor Oct. 24, 1944 

